drivers/media/i2c/tlv320aic23b.c

   1 /*
   2  * tlv320aic23b - driver version 0.0.1
   3  *
   4  * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
   5  *
   6  * Based on wm8775 driver
   7  *
   8  * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
   9  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/slab.h>
  25 #include <linux/ioctl.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/i2c.h>
  28 #include <linux/videodev2.h>
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-ctrls.h>
  31
  32 MODULE_DESCRIPTION("tlv320aic23b driver");
  33 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  34 MODULE_LICENSE("GPL");
  35
  36
  37 /* ----------------------------------------------------------------------- */
  38
  39 struct tlv320aic23b_state {
  40         struct v4l2_subdev sd;
  41         struct v4l2_ctrl_handler hdl;
  42 };
  43
  44 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  45 {
  46         return container_of(sd, struct tlv320aic23b_state, sd);
  47 }
  48
  49 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  50 {
  51         return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
  52 }
  53
  54 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  55 {
  56         struct i2c_client *client = v4l2_get_subdevdata(sd);
  57         int i;
  58
  59         if ((reg < 0 || reg > 9) && (reg != 15)) {
  60                 v4l2_err(sd, "Invalid register R%d\n", reg);
  61                 return -1;
  62         }
  63
  64         for (i = 0; i < 3; i++)
  65                 if (i2c_smbus_write_byte_data(client,
  66                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  67                         return 0;
  68         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  69         return -1;
  70 }
  71
  72 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  73 {
  74         switch (freq) {
  75         case 32000: /* set sample rate to 32 kHz */
  76                 tlv320aic23b_write(sd, 8, 0x018);
  77                 break;
  78         case 44100: /* set sample rate to 44.1 kHz */
  79                 tlv320aic23b_write(sd, 8, 0x022);
  80                 break;
  81         case 48000: /* set sample rate to 48 kHz */
  82                 tlv320aic23b_write(sd, 8, 0x000);
  83                 break;
  84         default:
  85                 return -EINVAL;
  86         }
  87         return 0;
  88 }
  89
  90 static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
  91 {
  92         struct v4l2_subdev *sd = to_sd(ctrl);
  93
  94         switch (ctrl->id) {
  95         case V4L2_CID_AUDIO_MUTE:
  96                 tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
  97                 /* set gain on both channels to +3.0 dB */
  98                 if (!ctrl->val)
  99                         tlv320aic23b_write(sd, 0, 0x119);
 100                 return 0;
 101         }
 102         return -EINVAL;
 103 }
 104
 105 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
 106 {
 107         struct tlv320aic23b_state *state = to_state(sd);
 108
 109         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 110         return 0;
 111 }
 112
 113 /* ----------------------------------------------------------------------- */
 114
 115 static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
 116         .s_ctrl = tlv320aic23b_s_ctrl,
 117 };
 118
 119 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
 120         .log_status = tlv320aic23b_log_status,
 121 };
 122
 123 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
 124         .s_clock_freq = tlv320aic23b_s_clock_freq,
 125 };
 126
 127 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
 128         .core = &tlv320aic23b_core_ops,
 129         .audio = &tlv320aic23b_audio_ops,
 130 };
 131
 132 /* ----------------------------------------------------------------------- */
 133
 134 /* i2c implementation */
 135
 136 /*
 137  * Generic i2c probe
 138  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 139  */
 140
 141 static int tlv320aic23b_probe(struct i2c_client *client,
 142                               const struct i2c_device_id *id)
 143 {
 144         struct tlv320aic23b_state *state;
 145         struct v4l2_subdev *sd;
 146
 147         /* Check if the adapter supports the needed features */
 148         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 149                 return -EIO;
 150
 151         v4l_info(client, "chip found @ 0x%x (%s)\n",
 152                         client->addr << 1, client->adapter->name);
 153
 154         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 155         if (state == NULL)
 156                 return -ENOMEM;
 157         sd = &state->sd;
 158         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
 159
 160         /* Initialize tlv320aic23b */
 161
 162         /* RESET */
 163         tlv320aic23b_write(sd, 15, 0x000);
 164         /* turn off DAC & mic input */
 165         tlv320aic23b_write(sd, 6, 0x00A);
 166         /* left-justified, 24-bit, master mode */
 167         tlv320aic23b_write(sd, 7, 0x049);
 168         /* set gain on both channels to +3.0 dB */
 169         tlv320aic23b_write(sd, 0, 0x119);
 170         /* set sample rate to 48 kHz */
 171         tlv320aic23b_write(sd, 8, 0x000);
 172         /* activate digital interface */
 173         tlv320aic23b_write(sd, 9, 0x001);
 174
 175         v4l2_ctrl_handler_init(&state->hdl, 1);
 176         v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
 177                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 178         sd->ctrl_handler = &state->hdl;
 179         if (state->hdl.error) {
 180                 int err = state->hdl.error;
 181
 182                 v4l2_ctrl_handler_free(&state->hdl);
 183                 return err;
 184         }
 185         v4l2_ctrl_handler_setup(&state->hdl);
 186         return 0;
 187 }
 188
 189 static int tlv320aic23b_remove(struct i2c_client *client)
 190 {
 191         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 192         struct tlv320aic23b_state *state = to_state(sd);
 193
 194         v4l2_device_unregister_subdev(sd);
 195         v4l2_ctrl_handler_free(&state->hdl);
 196         return 0;
 197 }
 198
 199 /* ----------------------------------------------------------------------- */
 200
 201 static const struct i2c_device_id tlv320aic23b_id[] = {
 202         { "tlv320aic23b", 0 },
 203         { }
 204 };
 205 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
 206
 207 static struct i2c_driver tlv320aic23b_driver = {
 208         .driver = {
 209                 .name   = "tlv320aic23b",
 210         },
 211         .probe          = tlv320aic23b_probe,
 212         .remove         = tlv320aic23b_remove,
 213         .id_table       = tlv320aic23b_id,
 214 };
 215
 216 module_i2c_driver(tlv320aic23b_driver);